Here is my dilemna. I have a 96 Blazer with a bad lower end (rapping and no oil pressure). On the other hand, I also have 4.3l from an 86 El Camino with only 84k original miles on it. (swapped it out with a built Vortec 350.) Can I bolt the 96 heads/intake etc onto the 86 block so that I can use the same harness in the Blazer?